Since I'm sure you're just as tired as I am of dealing with the lack of UG updating, I suggest you write (which I've done) to Rod Harrison—the Chief Technology Officer of Drobo who probably now has some influence at Retrospect "Inc". If you want to impress him with a Swedish-stamped "snail-mail":

Drobo

Attn.: Mr. Rod Harrison, CTO

1289 Anvilwood Ave.

Sunnyvale, CA 94089

USA

However, if you are willing to enroll in LinkedIn—which I am not because of delete-finger tiredness—you should be able to get an e-mail address for Harrison there.